Type-writing machine.



W.-E. BARNARD.

I TYPE WRITING MAGHINE. APPLICATION FILED MAY3, 1910.

Patented May 20, 1913.

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frwenbr: Mi a/MM Kw/My W. E. BARNARD. TYPE WRITING MACHINE.

APPLIGATION FILED MAYB, 1910.

Patented May 20, 1913.

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I UNITED STATES PATENT ()FFICE.

WALTER BARNAnn, or HARTFORD, ooNNEorioUT, ASSIGNOR 'ro nmmnwoon TYPE-WRITER COMPANY, or NEW YORK, N. Y., A CORPORATION or DELAWARE.

TYPE-WRITING. MACHINE.

v Specification of Letters Patnt. Application filed May s, 1910. Serial No. 559,153.

Patented May 20,1913.

new and useful Improvements in 'Type- Writing Machines, of which the following is a specification.

My invention relates to a back spacing device, or means for setting back the powerdriven carriage of a typewriter spaces, or-

dinarily a space at a time, without other manipulation than the operation of a key on the keyboard. 'Back spacing devices should, upon each operation, engage the carriage rack with certainty, and act positively during the entire backward throw. During the throw, the carriage rack is preferably locked against lateral displacement by the 3 back spacing device. The mechanism should -in-;

clude positive means for" preventing overthrow of the carriage rack;- and. for returning. the parts promptly and with certainty to initial position after the throw.

The object of the present invention is to meet the above requirements in a device whichis simple'and durable in structure,

' and which involves but fe\ v movements,so

ice or wear of parts.

thatthe engagement and disengagement of 'so' the device and the carriage maybe certain and reliable, regardless of length of serv- In the present invention, the device which actually throws the carriage rack is.a pivtion as the back throw of the carriage.

oted dog operated from the'key by'a suitable system of levers. In "the preferred form of my apparatus, the action of the dog is a pull exerted substantially in the same direc- It can exert little, if any, upward pressure on thecarriage, and'as a result is not subject to rebound or depression from the latter.

It is so arranged thatit cannot bind with the-carriage; and its every movement is positively determined by stops. I

Other objects and features of the invention will appear from the following specification taken in connection with the accompanying drawings in which:

Fi ml is a view infront elevation, showing the normal position of the dogand certain other parts ofthe device with re:

spect to the carriage rack and cscapement mechamsm. F1 2,1sas1m1lar new in front elevation, sho w1ngthe relative position of the parts upon slight depression of the key,

anism. Fig. 6 is a view showingthe lock I for preventing lift of the rack, and showing in cross section the normal position of the rack and do-g-supporting'lever' 13 with respect thereto. Flg. 7 is a view of theparts shown in Fig. 6 in the dposition assumed when the key is depresse 1 I The rack 1 is secured to the carriage and driven by the power drum 2 (Fig. 3) under control of an oscapement mechanism inthe usual manner. The escapement mechanism shown comprises the ratchet wheel .3, controlled by the dog-1 from the type keys,-and

connected to the rack, by ,means of pinion 5 and'pawls 6. The latter permit backward spacing of the rack without movement of the wheel 3.

The rack is spaced backward by a dog 7 operated from the key 8 through key lever 9, rock shaft 10 fast thereto, arm 11 also fast to shaft 10, red 12, and bell crank lever 13 which i'ocks on a. fixedpivot 14 and to an upstanding arm of'which lever the dog-7 is pivoted at 18. The pivot 14 of the lever 13 is carriedon arm 15 of a bracket 16 fixed to the frame of the machine. A spring 17 tends to return the lever 13 and key connections to norinal positions when the key is released. A spring 19 attached at one end; to the dog 7 andat the other end-to the level; 13, controls the movement of the dog 7 on its pivot 18. The movement of the dog 7 on 1ts pivot 18 is limited positively by a stop pin 20 on the lever 13 which lies within a slot 21 in the dog and is permitted a limited movement or play therein.

a To look the rack against upward movement or'displacement by the dog. there is pivotally mounted at 22 on thebracket 16, a hook 23, which, by means of a spring 24, is

' normally held in the position shown in Figs. -1, 4 and6. The normal position of the hook 23 with respect to the dog-operating lever 13 is shown in Fig. 6, in which it will be noted the lever 13 serves as a stop to limit the backward movement of the hook under the action of the spring 24 \Vhen, however,

the lever 13, upon depression of the back spucingkey, is rocked clockwise on ils pivo ti returns the hook v ring the hook'over the rack.

. ing key, the spring 14 from the'position shownin Fig. (rto the position shown in the hook 23 to move the latter forward over the rack against the actionof the spring 24. A shoulder 25 on the hook, on the other hand, serves as a stop for the lever 13. When the latter is returned, the spring .24 to normal position, as shown in Fig. 6.

The various movements of the dog 7 will now be more specifically pointed ,out. Its ,normal position, as heretofore stated, is as shown in Fig. 1, where it is depressed and out of engagement with the rack to permit the rack to have its normal feed. This position of the dog is determined by the stop 20, against which the spring 19 causes the dog to bear in such manner that the right hand side of the :slot 21 is in cont-act with the stop. When now the rod 12 the lever 13 and the dog turn bodily in clockwise direction about the pivot 14, the tooth of the dog swinging u sufiiciently to engage it with the rack, as s own in Fig. 2. The lever 13, in moving the dog into engagement with the rack, also moves sufficiently far over the cam surface on the book 23 to The lever 13 does not at-this time, however, engage the shoulder 25 on the hook, as shown in Fig. 7. Further movement of the bell'crank lever 13 around its pivot '14 causes the pivot 18 to continue moving to the right, carrying with it the dog, and also the rack with which the dog is engaged; the dog serving as a hook to enable the level'f fi-to draw the-rack back. The dog graduallyrocks on its moving pivot 18 counter-"clockwise against the action of the spring 19. This movement of the dog causes the left hand side of the slot 21 finally to engage the stop 20, as shown in Fig. 3, whereupon further clockwise movement or overthrow of the lever 13, is pre vented. The stop 20 at this time, by preventing depression or counter-clockwise movement of the dog on its pivot 18, prevents the dog from'being forced down and out by the rack. The shoulder 25 on the hook 123 is at this time engaged by the lever 13, and upward movement of the rack is prevented. Upon release of the back spacmoves the bell crank lever 13 toward normal position, carrying with it the dog 7; and simultaneously the spring 19 moves the dog on its pivot-until the stop 20 again reaches the right hand'side of slot 21, whereupon the lever 13 moving farther, depresses the dog from the rack,

and releases the hook 23 to enable the spring 24 to remove llll' hook from the rack, so that the parts are all again in normal position.

In order to prevent hack lash of the escapement wheel 8 spaced, the lever 13 carries a dog 26, which in the normal position of thelever 13 is out Fig. 7, it acts as a cam to is depressed,

the invention.

' whereby aspring tending-to turn the dog on when the rack isback is practically a straight pull on the rack in.

the direction of movement of the latter. The stop, 20 positively prevents overthrow of both lever 13 and dog, and. prevents forcible disengagement of the dog stops are all of a character to withstand hard usage and wear.

Whereas I have shown in the drawings one form or embodiment of the invention,it will be obvious to any one skilled in the art that the structure shown is capable of considerable modification wit in the scope of Having thus described my claim: a

1. In a-typewriting maehine, /'a powerdriven carriage havingan escapement rack, a back-spacingflog normally out of eng e-' mentwith the/rack, a support on which the dog is pivoted, "said support being also from the rack; and the stop 25 is a positive stop to the ClOCkWlSG movement of the lever 13. These invention, I

pivotally mounted in the machine, interlocking means on the dog and itssupport whereby the pivotal movementof the dog on its support is limited in both directions, a spring tending to turn the dog on its pivot into engagement with the rack, but normally restrained fromso doing by said interlocking means in one direction, means for moving the support on its pivot to bring the dog to the rack without the dog on its own pivot, andfor thereafter moving the dog with the rack to back space the latter, the rack acting during the back-spacing movement to move the dog on its pivot against the action of said spring until such pivotal stopped by the engagement of the interlocking means in the other direction.

2. In a typewriting machine, a powerdriven carriage having an escapement rack, a back-spacing dog normally out ofengagement with the rack, a support on which the dog is pivoted, said support being also pivot'ally mounted in the machine, interlocking means on the dog and its support the pivotal movement of the dog on its support" is limited in both directions, its but pivot intogengagement with the; rack,

by said normally restrained from "so doing movement of interlocking'means in one direction, means I for movingfthe support onits pivottobring the do'g to the rack without movement of the dogon its 'own pivot, and for thereafter moving the dog with the rack to back-space. the latter, the rack acting during thebacka spacing movement to-move the dog on its pivot against the action of saidspring until such pivotal movement of the dog is stopped by the engagement of the interlocking means in the other direction, the position of the interlocking means in the latter direcdog is pivoted, said support being also pivotally-mounted in the machine, a stop on the dog support to limit the movement of the dog on its pivot toward the rack, a spring tending to turn the dog on its pivot toward the rack, but normally prevented from so doing by the stop, and means for moving the support on its pivot to bring the dog to the rack without mov'em'entof the dog on its own pivot, and for thereaftermoving the dog with the rack to back-spacing position, the dog, during back-spacing movement, accommodating itself to the angular movement of the supportby reason of the aforesaid spring.

4. In a typewriting machine, a p0werdriven carriage having an escapement rack, a back-spacing dog, a support on which the dog is pivoted, said support being also pivoted in the machine and being movable on its pivot with the dog to back-space the rack, resilient means controlling the movement of the dog on its pivot for keeping the dog from binding with the rack or becoming disengaged there om during the back-spacing movement, the dog being in the form of ahook which extends from its pivot in the direction of forward feed of the rack and exerts a pull onthe latter in the back-spacing operation. '-5. In a typewriting machine, a powerdriven carriage having an escapement rack, a back-spacing dog, a support on which the dog is pivoted, said support being also pivoted in the machine and being movable on its pivot with the. dog to back-space the rack, resilient means controlling the movement of the dog on its pivot for keepingthe dog from binding with the rack or be- .coming. disengaged therefrom during the back-spacing movement, the dog being in the form of a hook which extends from its pivot in the direction of forward feed of the rack and exerts a pull on the latter in the back-spacing o eration, and the pivotof the dog lying su stantially in a perpen dicular linefrom the pivot-of the support to the rack,v whereby the angular moverment'of the pivot of the dog with respect to the rack is slight.

6. In a typewriting machine, a power- I driven carriage having an escapement rack, a backspacingdog, means formoving the dog with the rack toback-spacin position, and means for locking the r'ac against displacement in the back-spacing operation,

said rack-locking means having a cam bearing on said dog moving means, whereby it is operated by the latter,. and having a shoulder at the end of said cam bearing to serve as a stop. to determine the back-spacing movement of the dog.

1 In a typewriting machine, the combination with a carriage having an escapement rack thereon, of a pivoted dog operating member on which a back spacing dog is pivoted, a spring tending to draw said dog against said rack, an escapement wheel comprising'a pinion working in said rack, a hook arranged to retain said rack in mesh with said pinion, a stop on the operating memberlimiting the drawing of said dog, and means for swinging said dog operating member on its pivot to move said dog against the rack and draw the carriage back.

8. In a typewriting machine, the combination with a carriage having an escapement rack thereon, of a pivoted dog operating member on which a backspacing dog is pivoted, a spring tending to draw said dog against said rack, an esc'apement wheel comprising a pinion working'in sa1d rack, a

.hook arranged to retain said rack in mesh with said pinion, a stop on the-operating member limiting the drawing of said dog, means for swinging said dog operating member on its pivot to move saidudog against the rack to draw the carriage back, and an extension on: said operating member arranged to arrest movement of said escapement wheel.

9. In a typewriting machine, the combination with a carriage having an escapement rack, of an escapement wheel comprisi ing a pinion working in saidrack, a back spacing dog, a spring tending to swing said dog into engagement with said rack, a dog carrier on an upstanding arm of which said dog is pivoted, a second arm on said carrier arranged to lock said escapement wheel, a

sto agzgnst the action of said spring, and means for swinging said dog carrier to cause said dog to engage said rack and draw the carriage back.

WALTER E. BARNARD. Witnesses:

DYORKMAN,

LYMAN D. BRoUer-rroN.

Copies oftlih patent may be obtained for five cents each, by addressing the "Commissioner of I'ate'nts, Washington, D. 0. W

on said carrier holding said dog" 

